Montgomery Airpark Dam (Asset 11568) Reservoir Report

Last Updated: December 5, 2025

Montgomery Airpark Dam, also known as Asset 11568, is a critical flood risk reduction infrastructure located in Montgomery Village, Maryland.


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Summary

Built in 1985, this earth dam stands at a height of 21.6 feet and has a length of 350 feet, providing vital protection against potential flooding events in the area. The dam has a normal storage capacity of 2 acre-feet and a maximum storage capacity of 26.7 acre-feet, serving the Cabin Branch-TR river or stream.

Despite its essential role in flood risk reduction, Montgomery Airpark Dam is currently assessed as being in poor condition with a high hazard potential. The last inspection conducted in February 2021 revealed the need for significant improvements to ensure the dam's structural integrity and safety. The dam is under the jurisdiction of the Maryland Dam Safety regulatory agency, which oversees its permitting, inspection, and enforcement processes. With a moderate risk rating of 3, there is a pressing need for risk management measures to be implemented to mitigate potential hazards associated with the dam.

As a crucial piece of infrastructure in the region, Montgomery Airpark Dam requires immediate attention and investment to address its poor condition and high hazard potential. Climate and water resource enthusiasts should closely monitor the dam's condition and advocate for necessary repairs and upgrades to ensure the safety and protection of the surrounding community from potential flooding risks.

Year Completed

1985

Dam Length

350

Dam Height

21.6

River Or Stream

Cabin Branch-TR

Primary Dam Type

Earth

Surface Area

2.3

Drainage Area

0.18

Nid Storage

26.7

Outlet Gates

Needle - 0

Hazard Potential

High

Foundations

Soil

Nid Height

22
       
Seasonal Comparison

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Dam Data Reference

Condition Assessment

Satisfactory
No existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.

Hazard Potential Classification

High
Dams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.